268 lines
9.6 KiB
Dart
268 lines
9.6 KiB
Dart
import 'dart:convert';
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import 'package:flutter/foundation.dart';
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import 'package:webview_flutter/webview_flutter.dart';
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import '../../data/json_schedule_import.dart';
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import 'school_navigation_policy.dart';
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import 'school_page_adapter.dart';
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enum SchoolConnectionState {
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signedOut,
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authenticating,
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connected,
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expired,
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unknown,
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}
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class SchoolSession extends ChangeNotifier {
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SchoolSession() {
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web = WebViewController()
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..setJavaScriptMode(JavaScriptMode.unrestricted)
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..setNavigationDelegate(
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NavigationDelegate(
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onNavigationRequest: (request) {
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final uri = Uri.tryParse(request.url);
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if (uri == null ||
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!SchoolNavigationPolicy.canNavigate(
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uri,
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isMainFrame: request.isMainFrame,
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)) {
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message = '学校跳转到了其他地址，已停止自动交接登录信息。';
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notifyListeners();
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return NavigationDecision.prevent;
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}
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return NavigationDecision.navigate;
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},
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onPageStarted: (_) {
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_pageGeneration++;
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_reader.invalidate();
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pendingDraft = null;
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if (!hasOpened) {
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return;
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}
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_loading = true;
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formReady = false;
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notifyListeners();
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},
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onPageFinished: _loaded,
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onWebResourceError: (error) {
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if (error.isForMainFrame == true) {
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_loading = false;
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message = '学校页面暂时未能加载，请检查网络或使用统一认证入口。';
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notifyListeners();
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}
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},
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onHttpError: (error) async {
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final current = Uri.tryParse(await web.currentUrl() ?? '');
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if (!hasOpened ||
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error.request == null ||
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error.request!.uri != current) {
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return;
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}
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_loading = false;
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message = '学校页面请求未完成，可稍后重试。';
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notifyListeners();
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},
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),
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);
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}
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late final WebViewController web;
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final _reader = SchoolReader(SchoolPageAdapter());
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SchoolConnectionState connectionState = SchoolConnectionState.signedOut;
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bool _loading = false,
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_submitting = false,
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hasOpened = false,
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formReady = false;
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bool get busy => _loading || _submitting || _reader.busy;
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int _pageGeneration = 0;
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ImportDraft? pendingDraft;
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String message = '请通过学校统一身份认证登录。';
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String get statusLabel => switch (connectionState) {
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SchoolConnectionState.signedOut => '未登录',
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SchoolConnectionState.authenticating => '请在学校页面完成认证',
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SchoolConnectionState.connected => '学校认证已确认',
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SchoolConnectionState.expired => '学校登录已过期',
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SchoolConnectionState.unknown => '学校页面已打开 · 等待完整课表',
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};
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static final authUrl = Uri.parse(
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'https://idas.uestc.edu.cn/authserver/login',
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);
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static final timetableUrl = Uri.parse(
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'https://yjsjy.uestc.edu.cn/pyxx/pygl/xskbcx/index/1',
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);
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Future<void> open() => openTimetable();
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Future<void> openTimetable() async {
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hasOpened = true;
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_loading = true;
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pendingDraft = null;
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message = '正在打开研究生课表页面…';
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notifyListeners();
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try {
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await web.loadRequest(timetableUrl);
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} catch (_) {
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_loading = false;
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message = '学校课表页面无法打开，请检查校园网络。';
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notifyListeners();
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}
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}
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Future<void> openAuthentication() async {
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hasOpened = true;
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_loading = true;
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message = '正在准备学校认证…';
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notifyListeners();
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try {
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await web.loadRequest(authUrl);
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} catch (_) {
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_loading = false;
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message = '学校认证页面暂时不可用。';
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notifyListeners();
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}
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}
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static const _readyScript = """(() => {
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if (location.origin !== 'https://idas.uestc.edu.cn' || location.pathname !== '/authserver/login') return false;
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const f = document.querySelector('.login-main #pwdFromId');
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if (!f || f.method.toLowerCase() !== 'post') return false;
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const action = new URL(f.action, location.href);
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return action.origin === location.origin && action.pathname === '/authserver/login'
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&& !!f.querySelector('#username') && !!f.querySelector('#password')
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&& !!f.querySelector('#saltPassword') && !!f.querySelector('#pwdEncryptSalt')
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&& !!f.querySelector('#login_submit') && typeof window.startLogin === 'function'
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&& typeof window.encryptPassword === 'function' && typeof window.checkUserCaptcha === 'function';
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})()""";
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bool _truth(Object value) => value == true || value.toString() == 'true';
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Future<void> _loaded(String url) async {
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if (!hasOpened) {
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return;
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}
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_loading = false;
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final generation = _pageGeneration;
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final uri = Uri.tryParse(url);
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if (uri != null && SchoolNavigationPolicy.canInjectCredentials(uri)) {
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connectionState = connectionState == SchoolConnectionState.connected
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? SchoolConnectionState.expired
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: SchoolConnectionState.authenticating;
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try {
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final ready = _truth(
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await web.runJavaScriptReturningResult(_readyScript),
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);
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if (!hasOpened || generation != _pageGeneration) return;
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formReady = ready;
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} catch (_) {
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if (!hasOpened || generation != _pageGeneration) return;
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formReady = false;
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}
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message = formReady ? '可以使用应用界面登录；验证码会在学校页面完成。' : '请使用学校原页面完成认证。';
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} else if (uri != null && SchoolNavigationPolicy.isTimetable(uri)) {
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connectionState = SchoolConnectionState.unknown;
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message = '已打开课表页面，正在核对课程结构。';
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try {
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final draft = await readTimetable();
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if (!hasOpened || generation != _pageGeneration) return;
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pendingDraft = draft;
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connectionState = SchoolConnectionState.connected;
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} catch (error) {
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if (!hasOpened || generation != _pageGeneration) return;
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message = error is UnsupportedSchoolLayout
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? error.toString()
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: '课表读取未完成，已有课表保持不变。';
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}
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} else {
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connectionState = SchoolConnectionState.unknown;
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message = '可点击右上角日历打开学校课表。';
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}
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notifyListeners();
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}
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Future<void> submitCredentials(String username, String password) async {
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if (busy) return;
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_submitting = true;
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message = '正在交接学校认证…';
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notifyListeners();
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try {
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final url = Uri.tryParse(await web.currentUrl() ?? '');
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if (url == null ||
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!SchoolNavigationPolicy.canInjectCredentials(url) ||
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!_truth(await web.runJavaScriptReturningResult(_readyScript))) {
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throw StateError('学校表单尚未准备好，请使用学校页面登录');
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}
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final result = await web.runJavaScriptReturningResult('''(() => {
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if (!($_readyScript)) return false;
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const f = document.querySelector('.login-main #pwdFromId');
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const u = f.querySelector('#username'), p = f.querySelector('#password');
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u.value = ${jsonEncode(username)}; p.value = ${jsonEncode(password)};
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p.removeAttribute('readonly');
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u.dispatchEvent(new Event('input', {bubbles:true}));
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p.dispatchEvent(new Event('input', {bubbles:true}));
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window.checkUserCaptcha(); return true;
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})()''');
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if (!_truth(result)) throw StateError('学校表单已变化，请使用学校页面登录');
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var settled = false;
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for (var i = 0; i < 20; i++) {
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if (_truth(
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await web.runJavaScriptReturningResult(
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'!!window.jQuery && window.jQuery.active === 0',
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),
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)) {
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settled = true;
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break;
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}
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await Future<void>.delayed(const Duration(milliseconds: 200));
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}
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final current = Uri.tryParse(await web.currentUrl() ?? '');
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if (!settled ||
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current == null ||
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!SchoolNavigationPolicy.canInjectCredentials(current)) {
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message = '请在学校页面继续完成验证。';
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return;
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}
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await web.runJavaScript('''(() => {
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if (!($_readyScript)) return;
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window.startLogin(document.querySelector('.login-main #pwdFromId #login_submit'));
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})()''');
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message = '已交给学校处理；如有验证码，请在学校页面完成。';
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} catch (_) {
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message = '登录交接未完成，请使用学校页面继续。';
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} finally {
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_submitting = false;
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notifyListeners();
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}
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}
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Future<ImportDraft> readTimetable() async {
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final uri = Uri.tryParse(await web.currentUrl() ?? '');
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if (uri == null) throw UnsupportedSchoolLayout();
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return _reader.read(uri, () async {
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final raw = await web.runJavaScriptReturningResult(
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'JSON.stringify(document.documentElement.outerHTML)',
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);
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final value = raw is String ? raw : raw.toString();
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try {
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final decoded = jsonDecode(value);
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return decoded is String ? decoded : value;
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} catch (_) {
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return value;
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}
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});
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}
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Future<void> logout() async {
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_pageGeneration++;
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_reader.invalidate();
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hasOpened = false;
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await WebViewCookieManager().clearCookies();
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await web.clearCache();
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await web.clearLocalStorage();
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await web.loadHtmlString('<html></html>');
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_loading = false;
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hasOpened = false;
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pendingDraft = null;
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formReady = false;
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connectionState = SchoolConnectionState.signedOut;
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message = '已退出学校登录。';
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notifyListeners();
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}
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}
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